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Note 19 - Quarterly Financial Information (Unaudited) - Summarized Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net sales	$ 50,697	$ 47,808	$ 49,019	$ 42,931	$ 37,220	$ 35,684	$ 37,886	$ 37,053	$ 190,455	$ 147,843	$ 146,132
Gross profit	12,706	12,431	12,986	10,185	7,837	8,193	9,941	9,516	$ 48,308	$ 35,487	$ 34,650
Net income	$ 4,410	$ 4,134	$ 3,990	$ 1,777	$ 2,714	$ 1,695	$ 2,630	$ 2,171
Basic net income per share (in dollars per share)	$ 0.60	$ 0.56	$ 0.54	$ 0.24	$ 0.38	$ 0.23	$ 0.36	$ 0.30	$ 1.95	$ 1.27	$ 1.11
Diluted net income per share (in dollars per share)	$ 0.59	$ 0.56	$ 0.54	$ 0.24	$ 0.37	$ 0.23	$ 0.36	$ 0.30	$ 1.93	$ 1.26	$ 1.10

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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